An MC 12x10.6 ledger channel frames the stair landing and fastens to a 7-1/4 inch concrete tilt-up wall. Connection to the concrete is achieved using a 3/8 by 3-1/2 by 9 inch steel plate secured by two 3/4 inch diameter A-325 N bolts and 1/2 inch diameter Simpson Titen HD anchors spaced at 18 inches on center. A 1/4 inch fillet weld joins the channel to the embedded plate assembly.
MC 12"x10.6 LEDGER FOR STAIR LANDING 1/2" DIA. SIMPSON TITEN HD ANCHORS @ 18" O.C. 7 1/4" CONCRETE TILT-UP WALL 3/8"x3-1/2"x9" PLATE w/ (2) 3/4" DIA. A-325 N BOLTS 1/4" 1 1/2" DIA. O.D. TUBE 1 1/2" DIA. PIPE RAIL 3'-6" 4 3/8" DIA. SPHERE SHALL NOT PASS THROUGH 1'-0 1/16" 27" MAX TYP. 4'-0" 1 1/2" DIA. HORIZONTAL GUARDRAIL. NOT ALLOW 4" SPHERE TO PASS THROUGH 1 1/2" STD. PIPE GUARDRAIL AND HANDRAIL ROUND ALL EDGES, SAND SMOOTH GALVANIZED FINISH 1 1/4" X 3/16" FLAT BAR GRATING AT LANDING AND TREADS, GALVANIZED FINISH MC 12"X10.6 STRINGERS AND LANDING - GALVANIZED FINISH SEE STRUCTURAL 12" MIN. HANDRAIL EXTENSION - PROVIDE SUBMITTAL FOR APPROVAL PRIOR TO FABRICATION CONCRETE FILLED PIPE BOLLARD SEE A001 OPENINGS IN IN TREADS AND LANDINGS SHALL BE A SIZE THAT DOES NOT PERMIT PASSAGE OF 1/2" DIAMETER SPHERE. ELONGATED OPENINGS SHALL BE PLACED SO THAT THE LONG DIMENSION IS PERPENDICULAR TO THE DIRECTION OF TRAVEL (IBC 1011.7.1) RETURN HANDRAIL TO GUARDRAIL PER IBC 1014.6 STD. COLUMN GALVANIZED FINISH SEE STRUCTURAL LEVEL 01 100'-0" SEE STRUCTURAL FOR CONNECTION 12" MIN. HANDRAIL EXTENSION - PROVIDE SUBMITTAL FOR APPROVAL PRIOR TO FABRICATION RETURN HANDRAIL TO GUARDRAIL PER IBC 1014.6 1'-0" NOTE: ACTUAL STAIRS TO BE PRE-ENGINEERED BY STEEL FABRICATOR. PROVIDE SHOP DRAWINGS FOR REVIEW. NOTE: MINIMUM REQ'D TREAD DEPTH IS 11" MINIMUM REQ'D RISER HEIGHT IS 7". 1" = 1'-0" A401 D2 LANDING SUPPORT 1" = 1'-0" A401 C2 STAIR BEAM TO CONCRETE WALL CONNECTION 1" = 1'-0" A401 D3 GUARDRAIL DETAIL 1/2" = 1'-0" A401 C4 ENLARGED STAIR SECTION
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